EP2206220B1 - Rotor pour moteur électrique, moteur électrique et pièce à main de dentisterie - Google Patents

Rotor pour moteur électrique, moteur électrique et pièce à main de dentisterie Download PDF

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Publication number
EP2206220B1
EP2206220B1 EP08802824A EP08802824A EP2206220B1 EP 2206220 B1 EP2206220 B1 EP 2206220B1 EP 08802824 A EP08802824 A EP 08802824A EP 08802824 A EP08802824 A EP 08802824A EP 2206220 B1 EP2206220 B1 EP 2206220B1
Authority
EP
European Patent Office
Prior art keywords
magnet
shaft
rotor
electric motor
centering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08802824A
Other languages
German (de)
English (en)
Other versions
EP2206220A1 (fr
Inventor
Bernhard Kuhn
Alexander Klee
Thomas Classen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kaltenbach and Voigt GmbH
Original Assignee
Kaltenbach and Voigt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kaltenbach and Voigt GmbH filed Critical Kaltenbach and Voigt GmbH
Publication of EP2206220A1 publication Critical patent/EP2206220A1/fr
Application granted granted Critical
Publication of EP2206220B1 publication Critical patent/EP2206220B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/02—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools
    • A61C1/06—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design characterised by the drive of the dental tools with electric drive
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C1/00—Dental machines for boring or cutting ; General features of dental machines or apparatus, e.g. hand-piece design
    • A61C1/08—Machine parts specially adapted for dentistry
    • A61C1/18—Flexible shafts; Clutches or the like; Bearings or lubricating arrangements; Drives or transmissions
    • A61C1/185—Drives or transmissions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H02K7/145—Hand-held machine tool

Definitions

  • the invention relates to a rotor for an electric motor, a corresponding electric motor, and a dental handpiece with such an electric motor.
  • a rotor of an electric motor for example in the form of a brushless electric motor, usually comprises a shaft 20 on which a magnet 40 between two balancing rings 100, 100 'is arranged.
  • a magnet 40 for example, two ball bearings 70 which are arranged around the two balancing rings 100, 100 'around on the shaft 20.
  • the rotation of the rotor takes place about the axis of rotation 80 of the shaft 20 and can be further transmitted from the shaft 20 either via a coupling system or via a gear to another shaft.
  • Such brushless electric motors for driving dental equipment such as dental handpieces, for example in the form of dental motor angle pieces used.
  • a dental handpiece 1 with a corresponding electric motor 10 is in Fig. 1 outlined.
  • a corresponding interference fit between the magnet 40 of the rotor and the shaft 20 is not common, and in particular for the following two reasons: First, the materials from which corresponding magnets are made, to some extent brittle and tend from a certain tensile stress to Tear. To some extent, a tensile stress would already arise when pressing the magnet. In addition, centrifugal forces occur during rotation, which also result in a tensile stress on the magnet. Overall, that would be Therefore, the burden of the magnet in this sense too big. Second, usually the coefficient of thermal expansion of the material making up the shaft, for example steel, is significantly different from that of the material making up the magnet. In general, the magnet expands under heat less than the wave. For this reason, in the case of a press fit of the magnet on the shaft, there would be a risk that the pressing compound would be reinforced in such a way that the magnet 40 bursts when heated.
  • the adhesive composite 24 requires an adhesive gap, is arranged in the adhesive. By the adhesive bond 24 too great a tensile stress can be avoided and the adhesive layer in the adhesive gap of the adhesive composite 24 can compensate for the different expansion behavior of the shaft 20 on the one hand and the magnet 40 on the other hand when heated.
  • the adhesive gap of the adhesive bond 24 with respect to the rotation axis 80 of the shaft 20 is formed more or less asymmetrically.
  • the resulting concentricity errors or the resulting imbalance then require subsequent balancing.
  • the magnet 40 is also ground after bonding and before balancing on the shaft. Although this causes the magnet 40 to run outside the shaft 20 almost without impact, but asymmetries of the bonding gap can not be eliminated thereby.
  • the quality of the coaxiality of the magnet 40 and the shaft 20 depends considerably on the thickness of the adhesive gap. The larger the gap, the larger the offset may be and the greater the "internal" imbalance.
  • reinforcements for magnets of rotors which are part of a balancing ring or which surround the magnets like sleeves are known from the state of the art. Such reinforcements serve to protect the magnets, for example from corrosion or from bursting, but do not affect the above-mentioned problems.
  • the mentioned reinforcements are glued to the magnets.
  • a permanent magnet rotor for electric machines is known in which on a rotor shaft end rings and a sleeve are pressed. Within the sleeve permanent magnet segments are arranged.
  • a rotor is known in which a ring magnet is pressed into a sleeve and the sleeve is pressed onto the rotor shaft.
  • the sleeve serves to center the ring magnet relative to the shaft.
  • the invention is based on the object to provide a rotor which allows a particularly precise and easy centering of the magnets.
  • a corresponding object arises for an electric motor with such a rotor or for a corresponding dental handpiece with such an electric motor.
  • a rotor for an electric motor having a shaft with a rotation axis, and at least one magnet arranged around the rotation axis. Furthermore, the rotor has a centering element which is fixedly connected to the shaft or as part of the shaft is formed, wherein the centering presses with respect to the axis of rotation of the shaft centering from the outside of the magnet.
  • the magnet is arranged on the outer circumference of the shaft.
  • the centering element and the magnet are at least partially connected to each other via a press fit or a shrink fit.
  • the centering element has a sleeve-like region, which comprises the magnet at least partially from the outside.
  • the sleeve-like region may have a circular-cylindrical inner wall whose diameter is adapted in the sense of a press connection or shrink-fit connection to an outer boundary surface of the magnet, for example an outer lateral surface of the magnet.
  • the rotor further comprises at least one balancing ring which is arranged on the shaft, wherein the centering element is firmly connected to the balancing ring.
  • the centering element and the balancing ring are made in one piece.
  • the balancing ring is either pressed onto the shaft or shrunk onto the shaft.
  • the centering element comprises the magnet over the entire extent of the magnet along the shaft. But it can also be provided that the centering element comprises the magnet only over a part of the entire extent of the magnet along the shaft.
  • an adhesive bond is provided between the shaft and the magnet.
  • an electric motor which has a rotor according to the invention.
  • a dental handpiece which comprises an electric motor according to the invention.
  • FIG. 1 schematically illustrated and generally provided with the reference numeral 1 handpiece, in which the electric motor according to the invention is used, has an elongated grip sleeve 2, which is divided into a rear portion 2a, and a front portion 2b, both portions 2a, 2b at an angle a from about 155 ° to 170 ° with each other.
  • the handling of the handpiece 1 within the oral cavity of a patient is simplified by this angled design.
  • the use of the electric motor according to the invention described in more detail below is not limited to such so-called angle handpieces. Instead, the motor can generally be used in dental, dental or dental handpieces.
  • the head region 3 of the handpiece 1 which has a tool holder 5 rotatably mounted by means of two bearings 6a, 6b.
  • This tool holder 5 is provided in particular for receiving dental drills.
  • the head area 3 is designed such that the longitudinal axis of the work receiver 5 with the axis II of the front end portion 2b of the grip sleeve 2 encloses an angle ⁇ of about 100 °.
  • the tool holder 5 is thereby set in rotation by means of the motor 10 described in more detail below in rotation, wherein the rotation of the motor 10th via a drive shaft 15 which extends through the front Griflhülsen Scheme 2b, is forwarded.
  • the drive shaft 15 is in this case rotatably supported by means of two bearings 16a, 16b and coupled at its rear end via a gear 17 to the rotor 11 of the motor 10 and at its front end via a further gear 8 with the tool holder 5.
  • this is connected to a connection part 30 of a supply hose 31.
  • This tube 31 leads to a (not shown) supply device of a dental treatment center and serves to provide the handpiece 1, the media required for operation. This is in particular electricity that is used to operate the engine 10. Also, additional treatment media, such as air and / or water can be passed via the hose 31 to the handpiece 1. The connection of the handpiece 1 then takes place via a coupling element 4 located in the rear end, via which a connection with the hose connection 30 takes place.
  • Fig. 2 shows a cross section through a rotor according to the invention according to a first embodiment.
  • the rotor includes a shaft 20 having a rotation axis 80, and at least one magnet 40 disposed about the rotation axis 80.
  • the magnet 40 has at least one outwardly effective pole pair.
  • the magnet 40 has a cylindrical outer surface, hereinafter also referred to as a lateral surface, and a cylindrical, to the outer surface symmetrical, inner cylindrical opening whose diameter corresponds to the outer diameter of the shaft 20 so that the magnet 40 is arranged on the shaft 20 can be.
  • the magnet 40 is thus arranged on the outer circumference of the shaft 20 in this embodiment.
  • the rotor is arranged in a conventional manner via two bearings, for example two ball bearings 70 in an electric motor.
  • the electric motor may be provided, for example, in a dental handpiece for driving a dental tool, as in Fig. 1 outlined by the electric motor 10.
  • the rotor points as in Fig. 2 illustrated, further comprises a centering element 60 which is fixedly connected to the shaft 20 or alternatively formed as part of the shaft 20 can be.
  • the centering element 60 presses with respect to the rotation axis 80 of the shaft 20 centering from the outside on the magnet 40th
  • the centering element 60 and the magnet 40 are connected to each other according to the embodiment via a press fit or a press bond 22 '. It may also be provided via a shrink fit connection.
  • the compression composite 22 ' is provided on a surface of the magnet 40, which - with respect to the rotation axis 80 - is an outwardly directed surface. In this way, the centering element 60 can act or press on the magnet 40 from the outside.
  • the centering element 60 comprises a sleeve-like region, with an inner circular cylindrical clearance, the diameter of which is adapted in the sense of interference fit to the outer diameter of the magnet 40, that is to the diameter of the lateral surface of the magnet 40.
  • the centering element 60 or the sleeve-like region thus comprises the magnet 40 from the outside annular.
  • the centering element 60 is arranged with respect to the rotation axis 80 of the shaft 20 such that the cylindrical clearance is aligned symmetrically to the rotation axis 80.
  • the rotor further comprises a balancing ring 100, which is arranged directly next to the magnet 40 on the shaft 20.
  • the centering element 60 is firmly connected to the balancing ring 100, namely made from one piece with the balancing ring 100.
  • the centering element 60 is thus formed as a cup-like extension of the balancing ring 100, so to speak.
  • the sleeve-like region of the centering element 60 is in this case arranged on the balancing ring 100 such that, when the balancing ring 100 is mounted, the inner cylindrical clearance is oriented symmetrically with respect to the rotation axis 80.
  • the balancing ring 100 is in turn pressed onto the shaft 20 or shrunk.
  • the fixed connection between the centering element 60 and the shaft 20 is realized in the first embodiment.
  • the connection between the centering element 60 and the shaft 20 is so strong that the centering element 60 can form a support for the magnet 40, the magnet 40 at a designated rotation of the rotor with a desired accuracy with respect to the rotation axis 80 and respect Shaft 20 fixed in position.
  • the fit between the outer boundary surface of the magnet 40 and the inner boundary of the sleeve-like region of the centering element 60 is designed as an interference fit. This ensures that the magnet 40 must align with the balancing ring 100. Since the balancing ring 100 is also secured via a press fit on the shaft 20, a centering of the magnet 40 with respect to the rotation axis 80 of the shaft 20 is particularly simple and precisely possible. As an alternative or in addition to the press fits, corresponding connections are possible by shrinking, that is, shrinkage fits.
  • the centering element is thus firmly connected to the shaft, wherein this connection does not necessarily have to be realized via a balancing ring. It can also be provided, for example, that the centering element is designed in a pot-like manner with a central opening in the bottom region, wherein the opening is provided directly as a connecting region to the shaft. The centering element can thus be pressed or shrunk directly on the shaft in this case. In this case, for example, be provided that the centering element is arranged on the shaft immediately adjacent to the magnet. A balancing ring can then be provided on the other side of the centering element.
  • two balancing rings 100, 100 ' are provided, which are arranged on both sides of the magnet 40 on the shaft 20.
  • the second balancing ring 100 ' is formed symmetrically to the first balancing ring 100, so that therefore a second centering element 60' is provided and each of the two balancing rings 100, 100 'is fixedly connected to a respective centering element 60, 60'.
  • the centering elements 60, 60 ' are designed in such a way that they completely surround the magnet 40 in the assembled state, ie they abut each other with their end faces 45 of the sleeve-like regions that overlap the magnet 40 or are directly adjacent to one another.
  • the magnet 40 is thus completely enclosed in this case, so that by the centering elements 60, 60 'in addition to the centering function and a backup function, for example, against breaking or bursting of the magnet 40, can be met.
  • an adhesive composite 24 ' is provided in the first embodiment.
  • the inner diameter of the magnet 40 is formed symmetrically to the outer boundary surface of the magnet 40, ie to the lateral surface and also the outer boundary surface of the shaft 20 is formed symmetrically to the rotation axis 80, it results that the gap required for the adhesive of the adhesive composite 24 'between the Magnet 40 and the shaft 20 by the inventive arrangement inevitably uniformly strong at all points and is symmetrical to the axis of rotation 80.
  • the arrangement according to the invention is also with respect to the absolute width of the adhesive gap of the adhesive composite 24 'between the magnet 40 and the shaft 20. Since compared to the above-described prior art now the centering of the magnet 40 is no longer realized over a small gap can be chosen, a wider gap can be selected, which has the consequence that also adhesives can be used, which are viscous compared to the prior art, so in general also adhesives, which may have more adhesive power and / or better process.
  • the compressive stress which is exerted on the magnet 40 by the two centering elements 60, 60 also has an advantageous effect.
  • a critical speed at which the magnet 40 mechanically fails due to centrifugal forces is increased by the compressive stresses induced by the centering elements.
  • the tensile stresses resulting from centrifugal forces can thus be reduced by the centering elements.
  • the safety against bursting of the magnet 40 at a certain operating speed can be increased in this way. As a result, for example, fluctuations of mechanical material parameters of the magnet 40 can be better "intercepted".
  • the centering elements 60, 60 'the magnet 40 completely - so over the entire extent of the magnet 40 along the axis of rotation 80 - include, as provided in the first embodiment.
  • the invention provides a security function against loss of adhesive force between the shaft 20 and the magnet 40, because the pressing force between the centering elements 60, 60 'and the magnet 40 is sufficient to effectively transmit torque from the magnet 40 to the shaft 20.
  • the invention also works in particular in the case that no direct mechanical connection is provided between the inner opening of the magnet 40 and the area of the outer surface of the shaft 20 located in this opening.
  • the centering element 60 can be designed such that it fulfills a reinforcing function, ie provides protection against the magnet 40 from breaking out. This can be achieved by appropriate selection of a suitable material for the centering element, as well as a suitable choice of the strength or shape.
  • Fig. 3 is an example, not part of the claimed invention shown. In the following, only the differences from the first embodiment will be discussed.
  • a centering element 60 is provided, which is sleeve-shaped and which projects beyond the magnet 40 over its entire longitudinal extent along the axis of rotation 80. Between the centering element 60" and the magnet 40, in turn, a compression composite 22 'or shrinkage composite is provided.
  • the centering element 60 In the areas in which the centering element 60 "projects beyond the magnet 40 on both sides, the centering element 60" is in each case firmly connected to one of the two balancing rings 100, 100 ', again via a press connection 26'. Alternatively, the centering element 60 "on the two balancing rings 100, 100 'shrunk.
  • the two balancing rings 100, 100 ' are in each case fixedly connected to the shaft 20 via a press connection 28'.
  • the balancing rings 100, 100 ' may be shrunk onto the shaft 20.
  • centering element 60 In contrast to the first exemplary embodiment, only one centering element 60 "is provided here, wherein this centering element 60" projects beyond the magnet 40.
  • the centering element 60 “forms, so to speak, a centering sleeve which spans the two balancing rings 100, 100 '.
  • the magnet 40 is pressed into the centering sleeve.
  • the continuous design of the centering 60 "also allows a particularly good additional security feature, because - with respect to the Longitudinal extent of the rotation axis 80 - no gap at the level of the magnet 40 is formed.
  • an adhesive composite 24 ' may be provided.
  • the magnet 40 is pressed into the centering 60 "or in the centering, in a following step, the component thus formed is then pushed with the introduction of adhesive to the shaft 20 and in in a further following step, then the two balancing rings 100, 100 'are pressed in, which have a press or shrink fit both to the centering sleeve and to the shaft 20.
  • the centering element 60 is centered relative to the shaft 20 and thus also the magnet 40 with respect to the shaft 20.
  • an adhesive is selected which has a correspondingly long curing time.
  • connection between the centering element 60 "and the shaft 20 does not necessarily have to be via a balancing ring 100 or over the balancing rings 100, 100.
  • balancing rings 100, 100 ' instead of the balancing rings 100, 100 ', correspondingly symmetrically shaped annular components can be provided ,
  • a third embodiment is shown.
  • two centering elements 60 '" are again provided here, each of which is firmly connected to a balancing ring, that is to say, for example-as in FIG Fig. 4 shown - are made in one piece with the respective balancing ring 100, 100 '.
  • the two centering elements 60 '"do not extend along the axis of rotation 80 over the entire longitudinal extension of the magnet 40, but only comprise the magnet 40 in their respective edge sections
  • the symmetrical conditions are fulfilled.
  • the advantageous effect of the compressive stress acting externally on the magnet 40 is, in contrast to the first exemplary embodiment, less extensive, but acts in the two edge regions of the magnet 40, and precisely there are the edges which are particularly sensitive and preferably tend to break away.
  • the concentricity behavior of an electric motor can be favorably influenced, and this effect gains in importance as the speed increases, the erection is particularly suitable for high-speed motors, for example for high-speed dental engines.
  • the erection can be specified as a speed range of such an engine 30,000 to 200,000 U / min, with speeds above 200 000 U / min can be provided.

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Claims (8)

  1. Rotor pour moteur électrique,
    ledit rotor comprenant :
    - un arbre (20) avec un axe de rotation (80), et
    - au moins un aimant (40) disposé autour de l'axe de rotation (80),
    - un élément de centrage (60, 60',60", 60"') solidaire de l'arbre (20) ou faisant partie de l'arbre (20),
    dans lequel l'élément de centrage (60, 60',60", 60"') appuie sur l'aimant (40) depuis l'extérieur en le centrant par rapport à l'axe de rotation (80) de l'arbre (20), et
    dans lequel l'élément de centrage (60, 60',60", 60"') et l'aimant (40) sont reliés ensemble au moins en partie par ajustement serré ou ajustement fretté,
    dans lequel l'élément de centrage (60, 60',60", 60"') présente une zone de type douille entourant l'aimant (40) au moins partiellement depuis l'extérieur,
    caractérisé par
    - au moins un anneau d'équilibrage (100, 100') disposé sur l'arbre (20),
    dans lequel l'élément de centrage (60, 60',60", 60"') est solidaire de l'anneau d'équilibrage (100, 100'), et
    dans lequel l'élément de centrage (60, 60',60", 60"') et l'anneau d'équilibrage (100, 100') sont réalisés d'une seule pièce.
  2. Rotor selon la revendication 1, dans lequel l'aimant (40) est disposé sur la circonférence extérieure de l'arbre (20).
  3. Rotor selon la revendication 1 ou 2, dans lequel l'anneau d'équilibrage (100, 100') est pressé sur l'arbre (20) ou fretté sur l'arbre (20).
  4. Rotor selon l'une quelconque des revendications précédentes, dans lequel l'élément de centrage (60, 60',60", 60"') entoure l'aimant (40) sur l'étendue totale de l'aimant (40) le long de l'arbre (20).
  5. Rotor selon l'une quelconque des revendications 1 à 3, dans lequel l'élément de centrage (60, 60',60", 60"') n'entoure l'aimant (40) que sur une partie de l'étendue totale de l'aimant (40) le long de l'arbre (20).
  6. Rotor selon l'une quelconque des revendications précédentes, dans lequel un joint adhésif est prévu entre l'arbre (20) et l'aimant (40).
  7. Moteur électrique, comprenant un rotor selon l'une quelconque des revendications précédentes.
  8. Pièce à main dentaire, comprenant un moteur électrique selon la revendication 7.
EP08802824A 2007-10-19 2008-10-08 Rotor pour moteur électrique, moteur électrique et pièce à main de dentisterie Not-in-force EP2206220B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007050161 2007-10-19
DE102007062010A DE102007062010A1 (de) 2007-10-19 2007-12-21 Rotor für Elektromotor, Elektromotor und zahnärztliches Handstück
PCT/EP2008/008485 WO2009052948A1 (fr) 2007-10-19 2008-10-08 Rotor pour moteur électrique, moteur électrique et pièce à main de dentisterie

Publications (2)

Publication Number Publication Date
EP2206220A1 EP2206220A1 (fr) 2010-07-14
EP2206220B1 true EP2206220B1 (fr) 2012-12-12

Family

ID=40459027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08802824A Not-in-force EP2206220B1 (fr) 2007-10-19 2008-10-08 Rotor pour moteur électrique, moteur électrique et pièce à main de dentisterie

Country Status (5)

Country Link
US (1) US20100209872A1 (fr)
EP (1) EP2206220B1 (fr)
JP (1) JP2011501637A (fr)
DE (1) DE102007062010A1 (fr)
WO (1) WO2009052948A1 (fr)

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US5053664A (en) * 1989-01-18 1991-10-01 Aisan Kogyo Kabushiki Kaisha Motor-driven fuel pump
JPH0296494U (fr) * 1989-01-19 1990-08-01
DE4331803A1 (de) * 1993-09-18 1995-03-23 Bosch Gmbh Robert Elektronisch kommutierter Elektromotor
DE19644491A1 (de) * 1996-10-25 1998-04-30 Kaltenbach & Voigt Dentales Handstück
JP3483786B2 (ja) * 1998-12-14 2004-01-06 株式会社東芝 永久磁石形回転電機
JP2003111323A (ja) * 2001-07-24 2003-04-11 Honda Motor Co Ltd 発電電動機のロータ
JP3814173B2 (ja) * 2001-09-13 2006-08-23 三菱重工業株式会社 ロータ製造方法
DE10314394B4 (de) * 2003-03-28 2007-02-01 Siemens Ag Rotor für einen bürstenlosen Gleichstrommotor und Verfahren zur Montage eines solchen Rotors

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Publication number Priority date Publication date Assignee Title
CN103950020A (zh) * 2014-04-28 2014-07-30 常州赛迪工具有限公司 一种电动工具

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DE102007062010A1 (de) 2009-04-23
US20100209872A1 (en) 2010-08-19
EP2206220A1 (fr) 2010-07-14
WO2009052948A1 (fr) 2009-04-30
JP2011501637A (ja) 2011-01-06

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